/** 
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */
package com.tompai.activiti.service.impl;

import java.io.InputStream;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.activiti.bpmn.model.BpmnModel;
import org.activiti.engine.FormService;
import org.activiti.engine.HistoryService;
import org.activiti.engine.IdentityService;
import org.activiti.engine.ProcessEngine;
import org.activiti.engine.RepositoryService;
import org.activiti.engine.RuntimeService;
import org.activiti.engine.TaskService;
import org.activiti.engine.history.HistoricActivityInstance;
import org.activiti.engine.history.HistoricProcessInstance;
import org.activiti.engine.impl.RepositoryServiceImpl;
import org.activiti.engine.impl.persistence.entity.ProcessDefinitionEntity;
import org.activiti.engine.impl.pvm.PvmTransition;
import org.activiti.engine.impl.pvm.process.ActivityImpl;
import org.activiti.engine.runtime.ProcessInstance;
import org.activiti.engine.task.Task;
import org.activiti.image.ProcessDiagramGenerator;
import org.activiti.spring.ProcessEngineFactoryBean;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import com.tompai.activiti.domain.ActivitiDO;
import com.tompai.activiti.service.ActTaskService;
import com.tompai.common.utils.ShiroUtils;
import com.tompai.common.utils.StringUtils;

/**
 * @author: tompai
 * @email：liinux@qq.com
 * @createTime: 2019年11月24日 下午11:55:29
 * @history:
 * @version: v1.0
 */
@Service
public class ActTaskServiceImpl implements ActTaskService {
	@Autowired
	TaskService taskService;
	@Autowired
	IdentityService identityService;
	@Autowired
	RuntimeService runtimeService;
	@Autowired
	FormService formService;

	@Autowired
	RepositoryService repositoryService;

	@Autowired
	private ProcessEngineFactoryBean processEngineFactory;

	@Autowired
	private ProcessEngine processEngine;

	@Autowired
	private HistoryService historyService;

	@Override
	public List<ActivitiDO> listTodo(ActivitiDO act) {
		String userId = String.valueOf(ShiroUtils.getUserId());
		List<ActivitiDO> result = new ArrayList<ActivitiDO>();
		return result;
	}

	/**
	 * 提交任务, 并保存意见
	 *
	 * @param taskId    任务ID
	 * @param procInsId 流程实例ID，如果为空，则不保存任务提交意见
	 * @param comment   任务提交意见的内容
	 * @param title     流程标题，显示在待办任务标题
	 * @param vars      任务变量
	 */
	@Override
	public void complete(String taskId, String procInsId, String comment, String title, Map<String, Object> vars) {
		// 添加意见
		if (StringUtils.isNotBlank(procInsId) && StringUtils.isNotBlank(comment)) {
			taskService.addComment(taskId, procInsId, comment);
		}

		// 设置流程变量
		if (vars == null) {
			vars = new HashMap<>();
		}

		// 设置流程标题
		if (StringUtils.isNotBlank(title)) {
			vars.put("title", title);
		}

		// 提交任务
		taskService.complete(taskId, vars);
	}

	@Override
	public void complete(String taskId, Map<String, Object> vars) {
		// 2.1根据人物ID查询流程实力ID
		Task task = taskService.createTaskQuery().taskId(taskId).singleResult();
		// 获取流程实例ID
		String processInstance = task.getProcessInstanceId();
		// 2.2根据流程实例ID，人物ID，评论的消息，保存教师或者学术对与该学生申请的评论信息
//        taskService.addComment(taskId,
//                processInstance, "");
//        Map<String,Object> vars = new HashMap<>();
//        vars.put("pass",  "1" );
//        vars.put("title","");
		taskService.complete(taskId, vars);
	}

	/**
	 * 启动流程
	 *
	 * @param procDefKey    流程定义KEY
	 * @param businessTable 业务表表名
	 * @param businessId    业务表编号
	 * @param title         流程标题，显示在待办任务标题
	 * @param vars          流程变量
	 * @return 流程实例ID
	 */
	@Override
	public String startProcess(String procDefKey, String businessTable, String businessId, String title,
			Map<String, Object> vars) {
		String userId = ShiroUtils.getUser().getUsername();// ObjectUtils.toString(UserUtils.getUser().getId())

		// 用来设置启动流程的人员ID，引擎会自动把用户ID保存到activiti:initiator中
		identityService.setAuthenticatedUserId(userId);

		// 设置流程变量
		if (vars == null) {
			vars = new HashMap();
		}

		// 设置流程标题
		if (StringUtils.isNotBlank(title)) {
			vars.put("title", title);
		}

		// 启动流程
		ProcessInstance procIns = runtimeService.startProcessInstanceByKey(procDefKey, businessId, vars);

		return null;
	}

	/**
	 * 获取流程表单（首先获取任务节点表单KEY，如果没有则取流程开始节点表单KEY）
	 *
	 * @return
	 */
	@Override
	public String getFormKey(String procDefId, String taskDefKey) {
		String formKey = "";
		if (StringUtils.isNotBlank(procDefId)) {
			if (StringUtils.isNotBlank(taskDefKey)) {
				try {
					formKey = formService.getTaskFormKey(procDefId, taskDefKey);
				} catch (Exception e) {
					formKey = "";
				}
			}
			if (StringUtils.isBlank(formKey)) {
				formKey = formService.getStartFormKey(procDefId);
			}
			if (StringUtils.isBlank(formKey)) {
				formKey = "/404";
			}
		}
		return formKey;
	}

	@Override
	public InputStream tracePhoto(String xx, String pProcessInstanceId) {
////		ProcessInstance processInstance = runtimeService.createProcessInstanceQuery().processInstanceId(executionId).singleResult();
//        BpmnModel bpmnModel = repositoryService.getBpmnModel(processDefinitionId);
//
//        List<String> activeActivityIds = new ArrayList();
//        if (runtimeService.createExecutionQuery().executionId(executionId).count() > 0){
//            activeActivityIds = runtimeService.getActiveActivityIds(executionId);
//        }
//
//        // 不使用spring请使用下面的两行代码
//        // ProcessEngineImpl defaultProcessEngine = (ProcessEngineImpl)ProcessEngines.getDefaultProcessEngine();
//        // Context.setProcessEngineConfiguration(defaultProcessEngine.getProcessEngineConfiguration());
//
//        // 使用spring注入引擎请使用下面的这行代码
//        Context.setProcessEngineConfiguration(processEngineFactory.getProcessEngineConfiguration());
////		return ProcessDiagramGenerator.generateDiagram(bpmnModel, "png", activeActivityIds);
//        return processEngine.getProcessEngineConfiguration().getProcessDiagramGenerator()
//                .generateDiagram(bpmnModel, "png", activeActivityIds);

		// 获取历史流程实例
		HistoricProcessInstance historicProcessInstance = historyService.createHistoricProcessInstanceQuery()
				.processInstanceId(pProcessInstanceId).singleResult();

		if (historicProcessInstance != null) {
			// 获取流程定义
			ProcessDefinitionEntity processDefinition = (ProcessDefinitionEntity) ((RepositoryServiceImpl) repositoryService)
					.getDeployedProcessDefinition(historicProcessInstance.getProcessDefinitionId());

			// 获取流程历史中已执行节点，并按照节点在流程中执行先后顺序排序
			List<HistoricActivityInstance> historicActivityInstanceList = historyService
					.createHistoricActivityInstanceQuery().processInstanceId(pProcessInstanceId)
					.orderByHistoricActivityInstanceId().asc().list();

			// 已执行的节点ID集合
			List<String> executedActivityIdList = new ArrayList<String>();
			int index = 1;
			// 获取已经执行的节点ID
			for (HistoricActivityInstance activityInstance : historicActivityInstanceList) {
				executedActivityIdList.add(activityInstance.getActivityId());
				index++;
			}

			// 已执行的线集合
			List<String> flowIds = new ArrayList<String>();
			// 获取流程走过的线
			flowIds = getHighLightedFlows(processDefinition, historicActivityInstanceList);

			BpmnModel bpmnModel = repositoryService.getBpmnModel(historicProcessInstance.getProcessDefinitionId());
			// 获取流程图图像字符流
			ProcessDiagramGenerator pec = processEngine.getProcessEngineConfiguration().getProcessDiagramGenerator();
			// 配置字体

			InputStream imageStream = pec.generateDiagram(bpmnModel, "png", executedActivityIdList, flowIds, "宋体",
					"微软雅黑", "黑体", null, 2.0);
			return imageStream;
		}
		return null;
	}

	/**
	 * 获取需要高亮的线
	 * 
	 * @param processDefinitionEntity
	 * @param historicActivityInstances
	 * @return
	 */
	private List<String> getHighLightedFlows(ProcessDefinitionEntity processDefinitionEntity,
			List<HistoricActivityInstance> historicActivityInstances) {
		List<String> highFlows = new ArrayList<String>();// 用以保存高亮的线flowId
		for (int i = 0; i < historicActivityInstances.size() - 1; i++) {// 对历史流程节点进行遍历
			ActivityImpl activityImpl = processDefinitionEntity
					.findActivity(historicActivityInstances.get(i).getActivityId());// 得到节点定义的详细信息
			List<ActivityImpl> sameStartTimeNodes = new ArrayList<ActivityImpl>();// 用以保存后需开始时间相同的节点
			ActivityImpl sameActivityImpl1 = processDefinitionEntity
					.findActivity(historicActivityInstances.get(i + 1).getActivityId());
			// 将后面第一个节点放在时间相同节点的集合里
			sameStartTimeNodes.add(sameActivityImpl1);
			for (int j = i + 1; j < historicActivityInstances.size() - 1; j++) {
				HistoricActivityInstance activityImpl1 = historicActivityInstances.get(j);// 后续第一个节点
				HistoricActivityInstance activityImpl2 = historicActivityInstances.get(j + 1);// 后续第二个节点
				if (activityImpl1.getStartTime().equals(activityImpl2.getStartTime())) {
					// 如果第一个节点和第二个节点开始时间相同保存
					ActivityImpl sameActivityImpl2 = processDefinitionEntity
							.findActivity(activityImpl2.getActivityId());
					sameStartTimeNodes.add(sameActivityImpl2);
				} else {
					// 有不相同跳出循环
					break;
				}
			}
			List<PvmTransition> pvmTransitions = activityImpl.getOutgoingTransitions();// 取出节点的所有出去的线
			for (PvmTransition pvmTransition : pvmTransitions) {
				// 对所有的线进行遍历
				ActivityImpl pvmActivityImpl = (ActivityImpl) pvmTransition.getDestination();
				// 如果取出的线的目标节点存在时间相同的节点里，保存该线的id，进行高亮显示
				if (sameStartTimeNodes.contains(pvmActivityImpl)) {
					highFlows.add(pvmTransition.getId());
				}
			}
		}
		return highFlows;
	}

}
